Morris Minor Owners Club

It would seem that a faulty condenser was the cause of the misfire.

I checked over a few things, then tried fitting a new rotor arm with no improvement.
Then changed the condenser and immediately saw a massive improvement. No Backfire, no misfire.
Two short test drives and it's looking good so far.

Also fixed the exhaust issue with the arrival and fitment of a new 3-part stainless steel system.
Very nice. Quite easy to fit (even without a pit or proper Ramp), and it doesn't foul the bulkhead like the old one.

Tiddles is now running much sweeter, smoother and quieter than before and I've got my Moggy grin back!

BigG

Excellent.

It's always the condenser, as a rule, unless you have a Dizzy Doctor one or an "electronic" ignition!

The throttle return spring has absolutely nothing to do with the so called 'choke'.... Backfiring can only happen if there is unburned fuel in the exhaust - perhaps aided by the presence of air from the leaking exhaust - but the real problem was mis-firing caused by (apparently - and likely) the failing condenser.

bmcecosse wrote:The throttle return spring has absolutely nothing to do with the so called 'choke'.... Backfiring can only happen if there is unburned fuel in the exhaust - perhaps aided by the presence of air from the leaking exhaust - but the real problem was mis-firing caused by (apparently - and likely) the failing condenser.

Yup, thanks for the info!

Now sorted.

cheers!
G